Ohmly: Electrical Calculator

26 pro tools in one clean, ad-free app. Ohm's law, resistor and SMD codes, voltage drop, wire gauge, impedance, 555 timer, and more.

Your electrical toolkit, redesigned for speed. 26 pro tools, one clean app.

Ohmly is the modern electrical calculator for electricians, students, and engineers. Solve VIRP calculations, decode resistor and SMD codes, check voltage drop, size conductors, design circuits, and keep your work organized—without ads.

26 PRO TOOLS • Ohm's law, resistor color code, SMD resistor code • Series/parallel resistance, voltage divider, LED resistor • Reactance, resonance, AC impedance, power factor • RC/RL/LC filters, decibels, op-amp gain, 555 timer • Voltage drop, wire gauge/AWG, three-phase power • Motor FLA, conduit fill, short-circuit current • Transformer ratio, LM317 regulator • Capacitor code, inductor color code, PCB trace width • Heat sink thermal resistance and battery life

WHY OHMLY • Clean light and dark modes with no ads • Shared display metrics across every tool • Save, label, and search calculations • Export multi-calculation PDF reports • Home Screen, Lock Screen, and StandBy widgets • Full Apple Watch companion

Unlock Pro with a lifetime purchase or a low monthly plan.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/